hello i have a 2002 impala, i had a new pump put on, car was whining before i put the pump on, i took it back to have it check, they said the pump was defected, so the machnic put another one on, NOW it has been two days and this one is whining. also when i even start car up whining it is commer once you move up to 50----sounds like no fuid in car at all. does any body know why my chevy keeps whining???